Cool, I`m glad it was that junkware Gforce experience, i`ve just found another thread from other users about these latest drivers from Nvidia,( Seems they release a WHQL 378.72 GTA 5 throws up an error saying Video Memory exceeded on my GTX 1080 with all settings maxed at 1080p)
So until Nvida Cease it`s latest trend of hotfixing every WHQL driver 3 times which breaks more and more games, and inflicts memory eating bugs like... 1) PhysX is forced to the CPU even if GPU is chosen(This affects us gamers when using rendering software for 3d modelling and in game video rendering , apparently it`s fixed) 2) Nvidia debug control option has been grey for months now (Apparently it`s fixed) 3) If your using a G-Sync monitor(I do) the power will not shut off after you turn your pc off, stays in standby mode(3 Months and waiting for a fix)
So i`ve decided to go back 3 drivers to 376.33 which was the last stable driver i used for my GTX980TI in GTA5/LSPDFR, i hope Nvidia pulls their finger out and fixes these problems.